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datasketches-postgresql
PostgreSQL extension providing approximate algorithms based on apache/datasketches-cpp
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
pghero and/or https://github.com/supabase/index_advisor
If you want to pay for a saas then pganalyze is like $400 a month for 4 dbs is a pretty good pricing model
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